Re: [boost] [gsoc 2013] draft proposal for chrono::date

Subject: Re: [boost] [gsoc 2013] draft proposal for chrono::date
From: Howard Hinnant (howard.hinnant_at_[hidden])
Date: 2013-05-05 13:37:00

On May 5, 2013, at 1:09 PM, Anders Dalvander <boost_at_[hidden]> wrote:

> Sorry about that, should be:
> 
> chrono::date d = year(2013) / may / day(5);
> chrono::time t = hours(12) + minutes(34) + seconds(56);
> chrono::date_time dt(d, t);
> // Here `dt` should be the representation of May 5th 2013 at 12:34:56, but that in turn occurred at different instants for different people around the world.
> // In order to convert it to a `chono::system_clock::time_point` a timezone would be needed:
> chono::system_clock::time_point instant = dt.in_timezone(chrono::timezones::utc); // or perhaps `dt.in_utc()` for short.

Fwiw, I just ran this program fragment:

    day_point d = year(2013) / may / day(5);
    auto t = hours(13) + minutes(34) + seconds(30);
    auto dt = d + t;
    auto EDT = hours(-4);
    dt -= EDT;
    auto dt_now = system_clock::now();
    auto diff = dt_now - dt;
    std::cout << duration_cast<seconds>(diff).count() << " seconds\n";

And it output:

1 seconds

Howard